PROTECH QM1549 RMS IP67 Digital Multimeter User Manual

PROTECH QM1549 RMS IP67 Digital Multimeter

Safety Instructions

Before using the PROTECH QM1549 RMS IP67 Digital Multimeter, review the following safety guidelines to avoid shock or equipment damage.

• Improper use of this meter can cause damage, shock, injury, or death.
• Always remove the test leads before replacing the battery or fuses.
• Before using the meter, please inspect the condition of the test leads and the meter itself for any damage. If damage is present, please discontinue use.
• Do not measure voltage if the voltage on the terminals exceeds 1000V above earth ground.
• Use great care if voltages are greater than 30VAC RMS.
• Anything above this is considered a shock hazard.
• Always discharge capacitors and disconnect power before performing diode, resistance, or continuity tests.
• Do not exceed the maximum limits of the input values shown in the specification tables.
• Remove the batteries from the meter if it will be unused for an extended period of time.
• Always turn the function switch to the off position when not in use.

Box Content

• 1 x Multimeter
• 1 x Test Leads
• 1 x Carry Case
• 1 x 9V Battery
• 1 x User Manual

Overview

Symbols

Specifications

The following technical specifications apply to the PROTECH QM1549 RMS IP67 Digital Multimeter.

Functions

DC Voltage Measurement

When using the PROTECH QM1549 RMS IP67 Digital Multimeter for DC voltage testing, always observe polarity.

1. Set the function switch to the V DC position (“mV” will appear in the display).
2.  Insert the black test lead banana plug into the negative (COM) jack.
3. Insert the red test lead banana plug into the positive (VΩCAP) jack.
4. Touch the test probe tips to the circuit under test.
5. Be sure to observe the correct polarity (red lead to positive, black lead to negative).
6. Read the voltage in the display. The display will indicate the proper decimal point and value.
7. If the polarity is reversed, the display will show (-) minus before the value.

AC Voltage Measurement

1. Set the function switch to the VAC position.
2.  Insert the black test lead banana plug into the negative (COM) jack.
3.  Insert the red test lead banana plug into the positive (VΩCAP) jack.
4. Touch the test probe tips to the circuit under test.
5.  Read the voltage in the display.
6. The display will indicate the proper decimal point, value, and symbol (AC, V, etc).

DC Current Measurement

1. Insert the black test lead banana plug into the negative (COM) jack.
2. Press the mode button until “DC” appears in the display.
3. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.
4. Touch the black test probe tip to the negative side of the circuit.
5. Touch the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display. The display will indicate the proper decimal point, value, and symbol.

For current measurements up to

• 4000µA DC – set the function switch to the µA position and insert the red test lead banana plug into the (µA) jack.
• 400mA DC – set the function switch to the mA range and insert the red test lead banana plug into the (mA) jack.
• 10A DC -Set the function switch to the A position and insert the red test lead banana plug into the 10A jack.

AC  Current Measurement

1. Insert the black test lead banana plug into the negative (COM) jack.
2. Press the MODE button until ‘’AC” appears in the display.
3. Remove power from the circuit under test, then open up the circuit at the point where you wish to measure current.
4.  Touch the black test probe tip to the negative side of the circuit.
5. And touch the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit. Read the current in the display.
7. The display will indicate the proper decimal point, value, and symbol.

For current measurements up to

• 4000µA AC – set the function switch to the µA position and insert the red test lead banana plug into the (µA) jack.
• 400mA AC – set the function switch to the mA range and insert the red test lead banana plug into the (mA) jack.
• 10A AC – Set the function switch to the A position and insert the red test lead banana plug into the 10A jack.

Resistance Measurement

1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative (-) jack (COM)and the red test lead banana plug into the (+) jack (VΩCAP).
3.  Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading.
4.  Read the resistance in the display. The display will indicate the proper decimal point, value, and symbol.

Continuity Check

1. Set the function switch to the position.
2. Insert the black lead banana plug into the negative (-) jack (COM).
3. Insert the red test lead banana plug into the positive (+) jack (VΩCAP).
4. Press the button until the symbol appears in the display.
5. Touch the test probe tips to the circuit or wire you wish to check.
6. If the resistance is less than approximately 150Ω, the audible signal will sound. The display will also show the actual resistance.

Diode Test

1. Set the function switch to position.
2. Press the button until the symbol appears in the display.
3. Insert the black test lead banana plug into the negative (-) jack (COM).
4. Insert the red test lead banana plug into the positive (+) jack (VΩCAP).
5. Touch the test probe tips to the diode or semiconductor junction you wish to test.
6. Reverse the probe polarity by switching the probe position. Note this reading.
7. The diode or junction can be evaluated as follows:
8. If one reading shows a value and the other reading shows OL, the diode is good.
9. If both readings show OL, the device is open.
10. If both readings are very small or 0, the device is shorted.

Capacitance Measurements

1. Set the function switch to the CAP position (“nF”), and a small value will appear in the display.
2.  Insert the black test lead banana plug into the negative (-) jack (COM).
3. Insert the red test lead banana plug into the positive (+) jack (VΩCAP).
4.  Touch the test leads to the capacitor to be tested. The display will indicate the proper decimal point, value, and symbol.

Frequency Measurement

1. Set the function switch to the FREQ position.
2. Insert the black test lead banana plug into the negative (-) jack (COM).
3. Insert the red test lead banana plug into the positive (+) jack (VΩCAP).
4. Touch the test probe tips to the circuit under test.
5. Read the frequency in the display. The digital reading will indicate the proper decimal point, symbols (Hz, kHz), and value.

Measurement Specifications

The following guide is based on an environmental temperature of 18- 28°C and humidity <70%.

DC Voltage

• Input Impedance: 7.8MΩ
• Max. Input Voltage: 1000V DC

AC Voltage

• Input Impedance: 7.8MΩ
• Max. Input Voltage: 1000VAC RMS
• Frequency Range: 50~400Hz
• All AC voltage ranges are specified from 5% to 100% of the range.
• All AC voltages are autoranging except for 400mV.

DC Current

• Overload Protection: 0.5A/1000V and 10A/1000V fuse
• Maximum Inputs: 400mA DC RMS on µA/mA ranges, 10A DC RMS on 10A range. All µA and mA DC currents are autoranging.

AC Current

• Overload Protection: 0.5A/1000V and 10A/1000V fuse
• Frequency Range: 50~400Hz
• Maximum Inputs: 400mA AC RMS on µA/mA ranges, 10A AC RMS on 10A range. All µA and mA AC currents are autoranging.

Resistance

• Input Protection: 600VDC or 600VAC RMS

Capacitance

• Overload Protection: 600VDC or 600VAC RMS

Duty Cycle

• Pulse Width: >100µs, <100ms
• Frequency Width: 5Hz-150kHz
  
• Sensitivity: >0.8V RMS
• Overload Protection: 600VDC or 600VAC RMS

Diode Test

• Open Circuit Voltage: 1.5V DC typical
• Overload Protection: 600VDC or 600VAC RMS

Frequency

• Overload Protection: 600VDC or 600VAC RMS
• Sensitivity: >0.8V RMS while ≤1MHz, >3V RMS while >1MHz

Audible Continuity

• Overload Protection: 600VDC or 600VAC RMS

HZ% Duty Button Ranges

Maintainance

To avoid false readings, replace the battery as soon as the low battery power indicator appears.

1.  Turn the power off and disconnect the test leads from the meter.
2. Open the rear battery cover with a screwdriver.
3. Put the battery cover back in place, secure it with the screws.
4. Remove the old battery and insert the new battery into the battery holder, observing the correct polarity.

Replacing Fuses

1. Turn the power off and disconnect the test leads from the meter. Remove the cover.
2. Gently remove the old fuse and install the new fuse into the holder.
3. Always use a fuse of the proper size and value (0.5A/1000V fast blow for the 400mA range, 10A/1000V fast blow for the 10A range). Replace and secure the cover.

Specifications

These specifications apply to the PROTECH QM1549 RMS IP67 Digital Multimeter, ensuring accurate and reliable performance across various testing environments.

• Enclosure: Double-molded
• Display: 4,000 count LCD
• Over Range Indication: “OL” is displayed
• Auto Power: 15 min (approx)
• Polarity: Automatic, minus (-) sign for negative
• Low Battery Indication: BAT is displayed if the battery voltage drops below the operating voltage
• Battery: 1 x 9V
• Operating Temperature: 0°C to 50°C
• Storage Temperature: -20°C to 60°C
• Operating Humidity: <70%
• Storage Humidity: <80%
• Operating Altitude: 2000m maximum
• Weight: 375g
• Size: 182(L) x 82(W) x 55(H)mm

If you need detailed instructions for cable tracing tools, see the PROTECH XC5090 Network Cable Tracer Instruction Manual for reference.

Warranty

This product is protected by a lifetime warranty (from the date of purchase) covering all product manufacturing defects/faults that may occur within this timeframe.

This warranty does not cover damage caused by neglect, misuse, contamination, alteration, accident, or abnormal conditions of operation or handling, including failures caused by use outside of the product’s specifications, or the normal wear and tear of mechanical components. If you suspect your product is defective/faulty, cease using the product when the suspected defect/fault arises and return the product along with proof of purchase to the place of purchase or distributor for assessment.

Distributor contact details are available on the last page of this manualIfff the assessment concludes that the product is indeed defective/faulty, the product will either be repaired or replaced at no cost to you. Our goods come with guarantees that cannot be excluded under the Australian Consumer Law.

You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

Customer Support

• Email: support@whynter.com
• Website: WWW.WHYNTER.COM
• Tel:  800-443-6153

Product contents and specifications may change without notice. Copyright © 2024

FAQs

Q: What is the PROTECH QM1549 Digital Multimeter used for?

Professional electrical testing, troubleshooting, and maintenance can benefit from the QM1549, a high-precision digital multimeter that measures AC/DC voltage, current, resistance, capacitance, frequency, and temperature.

Q: What does RMS mean, and why is it important?

Root Mean Square is referred to as RMS. When working with contemporary electrical devices, the QM1549’s genuine RMS measurements guarantee precise readings for both clean and distorted AC signals.

Q: Can the QM1549 measure both AC and DC voltage?

Yes, depending on the measurement mode chosen, it can measure AC and DC voltage precisely over a wide range.

Q: Does the QM1549 have a data hold function?

Indeed, you may freeze the current value on the screen using the data hold button to make recording and scrutiny simpler.

Q: Can I use the multimeter outdoors in the rain?

Yes, because of its IP67 waterproof classification, but make sure the battery compartment is tightly covered and steer clear of prolonged submersion.

Q: What does the backlight function do?

In low-light or dark conditions, reading measures are made easier by the backlight’s illumination of the display.

Q: Can I measure diode functionality?

Indeed, the multimeter has a diode test mode that lets you check the forward voltage drop and confirm the health of the diode.

Q: Does the multimeter store data or connect to a PC?

No, the QM1549 is an independent device that doesn’t have a PC interface or data logging. The hold feature must be used to manually record data.